Refactor the channel mapping code for consistent naming
and make it more informed about channel allocations.
It still does nothing. Some blocking questions:
- how do we know ALSA audio stream's channel allocation?
- ALSA sequence is front/surr/clfe/side?
- what's the ALSA sequence for 3-9 channels?
- how do we map ALSA speakers(if available) to CEA speakers?
- Intel G45's channel mapping get verb seems to always return 0.
that could be a trouble.
Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxx>
---
sound/pci/hda/patch_intelhdmi.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
--- sound-2.6.orig/sound/pci/hda/patch_intelhdmi.c
+++ sound-2.6/sound/pci/hda/patch_intelhdmi.c
@@ -276,7 +276,7 @@ static void hdmi_set_channel_count(struc
chs, hdmi_get_channel_count(codec));
}
-static void hdmi_debug_slot_mapping(struct hda_codec *codec)
+static void hdmi_debug_channel_mapping(struct hda_codec *codec)
{
#ifdef CONFIG_SND_DEBUG_VERBOSE
int i;
@@ -291,13 +291,6 @@ static void hdmi_debug_slot_mapping(stru
#endif
}
-static void hdmi_setup_channel_mapping(struct hda_codec *codec)
-{
- snd_hda_sequence_write(codec, def_chan_map);
- hdmi_debug_slot_mapping(codec);
-}
-
-
static void hdmi_parse_eld(struct hda_codec *codec)
{
struct intel_hdmi_spec *spec = codec->spec;
@@ -445,6 +438,22 @@ static int hdmi_setup_channel_allocation
return -1;
}
+static void hdmi_setup_channel_mapping(struct hda_codec *codec,
+ struct hdmi_audio_infoframe *ai)
+{
+ if (!ai->CA)
+ return;
+
+ /*
+ * TODO: adjust channel mapping if necessary
+ * ALSA sequence is front/surr/clfe/side?
+ */
+
+ snd_hda_sequence_write(codec, def_chan_map);
+ hdmi_debug_channel_mapping(codec);
+}
+
+
static void hdmi_setup_audio_infoframe(struct hda_codec *codec,
struct snd_pcm_substream *substream)
{
@@ -456,6 +465,7 @@ static void hdmi_setup_audio_infoframe(s
};
hdmi_setup_channel_allocation(codec, &ai);
+ hdmi_setup_channel_mapping(codec, &ai);
hdmi_fill_audio_infoframe(codec, &ai);
}
@@ -553,9 +563,6 @@ static int intel_hdmi_playback_pcm_prepa
hdmi_set_channel_count(codec, substream->runtime->channels);
- /* wfg: channel mapping not supported by DEVCTG */
- hdmi_setup_channel_mapping(codec);
-
hdmi_setup_audio_infoframe(codec, substream);
hdmi_enable_output(codec);
--
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